Gnome does, but a WM that works isn't much use without apps that do likewise. Linux desktop software support for hdpi is an absurd mess. Some apps can switch re

Gnome does, but a WM that works isn't much use without apps that do likewise. Linux desktop software support for hdpi is an absurd mess. Some apps can switch resolution when you move them between screens. Others can't. When you combine this with Gnome's inability to deterministically start an app on the main monitor, this means sometimes it's sometimes literally impossible to get an app in the resolution & on the screen you want. Some apps start up with an apparently random resolution (Calibre, I'm looking at you!). What a horror show it is.